KNOWLTON — Two State Police troopers were injured during a traffic stop on Interstate 80 near the Pennsylvania border on Thursday.

New Jersey State Police cruiser (Dan Alexander, Townsquare Media NJ)

An officer had pulled over a Honda Accord on the westbound side near Exit 4 for Route 46 around 2 p.m. when the vehicle of a second officer who stopped to help was rear-ended by a dump truck, according to State Police.

The force pushed the second officer's vehicle into the Accord, hitting the first officer and the person who had been pulled over.  The officers were both flown via medical helicopter to Morristown Medical Center for non-life threatening injuries, according to police, who said the truck driver was not injured.

Police did not disclose the identities of anyone involved with the crash. No charges have been filed.

The incident closed the road for several hours into the afternoon rush, leaving drivers stuck for several hours. Video of the traffic showed drivers getting out of their vehicles waiting for traffic to get moving again.

The crash was the second major crash on Thursday afternoon to affect a North Jersey interstate. A crash on westbound Interstate 78 in Watchung caused big delays in both directions after a car went off the road and into the trees of the median.

Sign up for the WPG Talk Radio 104.1 Newsletter

Get South Jersey news and information e-mailed to you every week.